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INCOME TAXES (Effective income tax rate reconciliation) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 28, 2019 | Jun. 29, 2019 | Mar. 30, 2019 | Dec. 29, 2018 | Sep. 29, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 30, 2017 | Sep. 28, 2019 | Sep. 29, 2018 | Sep. 30, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Expected income provision based on the U.S. federal statutory tax rate |  |  |  |  |  |  |  |  | $ 7,284 | $ 43,568 | $ 41,358
Effect of earnings of foreign subsidiaries subject to different tax rates |  |  |  |  |  |  |  |  | (4,335) | (12,947) | (22,832)
Benefit from tax incentives |  |  |  |  |  |  |  |  | (5,084) | (20,429) | (23,294)
Benefit from research and development tax credits |  |  |  |  |  |  |  |  | (3,041) | (2,785) | (1,859)
Benefit from foreign tax credits |  |  |  |  |  |  |  |  | (22,744) | (3,939) | (26,119)
U.S. one-time transition tax |  |  |  |  |  |  |  |  | 9,369 | 101,854 | 0
Remeasurement of deferred taxes |  |  |  |  |  |  |  |  | 5,480 | 2,760 | 0
Non-deductible goodwill impairment |  |  |  |  |  |  |  |  | 0 | 0 | 8,805
Valuation allowance |  |  |  |  |  |  |  |  | 25,289 | 7,366 | 6,458
Foreign operations (withholding taxes, taxes on unrepatriated foreign earnings, and deemed dividends) |  |  |  |  |  |  |  |  | 8,578 | 5,746 | 6,039
Unrecognized tax benefit |  |  |  |  |  |  |  |  | 156 | 530 | 2,936
Non-deductible items |  |  |  |  |  |  |  |  | 2,248 | (758) | 778
Other, net |  |  |  |  |  |  |  |  | (290) | (222) | 336
Provision for (benefit from) income taxes | $ 3,804 | $ 3,864 | $ 4,672 | $ 10,570 | $ (1,750) | $ 7,282 | $ 4,800 | $ 110,412 | $ 22,910 | $ 120,744 | $ (7,394)
Effective Income Tax Rate Reconciliation, Percent |  |  |  |  |  |  |  |  | 66.00% | 68.00% | (6.20%)

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